Matrix for casting type characters.



No. 845,512. PATENTEDPEB. 26, 1907. P. H. BROWN, J. E. HANRAHAN & G. A. BOYDEN.

MATRIX FOR CASTING TYPE CHARACTERS.

APPLICATION FILED MAY 17,1905.

Human S 1 l wanton WVL/ caravan stra ns enrich.

FRANK H. BROWN AND JOHN E. HANRAHAN, OF BALTIMORE, AND GEOBJ A. BOYDEN, OF MOUNT WASHINGTON, MARYLAND, ASSIGNORS T J TIONAL COMPOSITE: COMPANY, A CORPORATION OF DELAWARE.

WATPMX Cfii'l'ihliz: TYPE. GHARACTERS= To all whom it may concern:

desired intaglio-type .formed by an electrodeposited filling 4, which Be it knou n that we, FRANK H. BROWN and JOHN E. H AAJRAHA I, oi the city of Baltimore'and State of Maryland, and GEORGE A. BOYDEN, of Mount Washington, in the county of Baltimore, State of Maryland, citizens of the United States, have invented certain new and useful Improvements in Matrices for Casting Type Lharacters, of which the following is a specification.

This invention pertains to a matrix for casting type characters, and consists of a metal plate having a single thickness and provided with a hole closed by an electrodeposited filling which contains the character, said filling being secured to the plate in such manner that portions of it are exposed both at the back and front. I

Matrices of the class to which this improvement relates have their intaglio-type characters formed. by the electrodeposition of metal over a positive or cameo type character. -Heretofore the electrodeposited filling containing the type characters have been backed up with an'additional plate, which is riveted to the plate containing the filling in order to secure the filling from becoming loose and to sufli'ciently protect it from being damaged in casting.

The invention is illustrated in the accompanymg drawings, in wh1ch higure 1 illustrates a front view ot-the matrix. Fig. 2 is a vertical section of the s me, and Fig. 3 illustrates an enlarged sectional view showing the manner in which the filling issecured in the matrix-plate The matrix-plate 1 has a hole 2 entirely through it sufiiciently large to admit of the character 3 being closes said hole. The surrounding edge. of the hole in the plate has an undercut groove 5.

In the process of making the matrix after the formation of the hole entirely through the plate the latter must be attached to a positive or cameo type character, which must be located accurately in the hole by entering from the frontside and temporarily closing said hole at that side, but leaving the hole open at the back, and then the plate and cameo-type character must be submitted to the electrodeposit-ion process. In the operation of this process the particles of copper or Specification of Letters Patent.

Application filed May 17,1905. Serial No. 260,737.

Patented Feb. 26, 1957..

I other metal enter the hole 2, which has be I left open at the back for this purpose. i particles of metal accumulate and pTOdlh a l the metal filling 4 over and around the s2 1 cameo type character, and also said particli enter the undercut groove 5 around the'ed 1 of the hole. \Vhen the electrodepositicn metal has been completed, the positive av I cameo-type character must be withdrawn from the front side, which side becomes the casting side of the'matrix-plate. This iron. side is left in a finished condition by the elitrodeposition process. The back or oppos side of the plate also exposes thatport'ion of the metal of the filling which comprisesthc border that fills the undercut At this stage of manufacture the back of the metal filling 4 and its border constitutes a cavity, which is then filled with a suitable metal 6, preferably in a molten condition; but whatever the condition of the metal comprising the back filling at the time it is placed in po sition the Whole of the back of the plate and both fillings are finally finished to auniform smooth surface, as seen in Figs. 2 and 3. This baclcfilling 6 gives stability to the fill ing 4 of the intaglio-type character and keeps the border of the metal which forms the character securely attached to the undercut groove 5. l

By this construction the plate which has heretofore been used to cover the entire baclq' surface of the matrix-plate may be dispensed with, the matrix can be produced at a less cost of labor and material, and is of less weight and bulk.

Having thus described our invention, what we claim as new, and desire to secure by-Letters Patent of the United States, is

1. A matrix for casting type-faces coniprising a single plate having a hole entirely through it with an'undercut groove formed in the edge or the hole, and an electrodeposited metal filling closing the said hole and containing the type character and secured to the single plate by engaging the said undercpt groove. I

2. A matrix for casting type-faces comprising two elements, namely, a plate having a'hole entirely through ityand a metal filling having an intagli0type character and closing said hole and exposed both at the back and front of the plate, and the two elements cured together by an undercut groove on one element being engaged by the contacting portion of the Other element. i

3. A matrix for casting typefaces comprising a plate having a hole entirely through.

it With undercuts in the edge of the hole, u g filling closing said hole and containing the tKpe character and secured by the border of e filling engaging said undercuts and said border also iornnng a, cavity at'the back of the filling, and a second. filling 1n said back I cavity which keeps the border of the first fill l ing pressed into engagement with said undercuts,

l In testimony whereof we affix our signar 5 l tures in presence of two Witnesses.

FRANK H. BROWN.

. JOHN E. HANRAHAN.

; GEORGE A. BOYDEN.

1 Witnesses:

1 ELnn DGE E. HENDERSON,

C. WALTER GwrNN. 

